Customer Question

I have a 1997 ford f150, 4.6l v8.I was backing over some ramps that had collapsed, I was using the gas and the brake at the same time so it was under load when it just stalled. no warning or anything it just quit. I have checked/replaced the coil packs-emg.fuel shutoff-all fuses/relay's i can find. I have checked all the fuses I can find,replaced the fuel pump,traced every wire I could find front to rear and still won't start. Alls it does is crank over. I had a 90's taurus wagon one time and had a problem like this and found a single fuse undr the dash that was blown, i replaced it and everything worked fine. does my truck have one hidden somewhere?? I t almost seems that it has a ground or fuse/power problem... what might you suggest??

no spark at the plugs, there is power to the coil packs and to the connector next to each plug.(injector plug???)

There doesn't seem to be any pressure in the fuel system.

There is not a theft system on this truck.

I have been working on this today and have found that the wiring pigtail coming off the fuel pump has no power to it. there are 4 wires in a round connector. if I unplug the connector there is power to the yellow and pink wires none to the other two, but when you plug the connector together the power stops flowing.

I have tested every fuse under the dash and under the hood that I have been able to find. I even connected a cable from the neg. side of the battery to the frame to see if it need a different ground. I pulled 2 plugs to see if they had any spark, they did not. I even tried cleaning the ground for the coil packs didn't help.

thx chris, but i have a book that has these schematics in it I have a chilton manual for the 97-00 p/u's-expedition-navigator. I think my son is going to haul it into a shop to get it looked at because I am disabled and not supposed to be doing this stuff....thx anyway

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Ron

ASE Certified Technician

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23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs

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